SUMMARY: An efficient system for cloning in is described which uses a newly constructed bacteriophage vector, 01O5J9. The phage genome contains cloning sites for the enzymes and , and can accommodate inserts of passenger of at least 4 kbp. Recombinant phages, which can both plaque and lysogenize normally, are recovered after direct transfection of protoplasts in the presence of polyethylene glycol. Several fully functional sporulation genes and one biosynthetic gene from have been isolated from genomic libraries that were constructed with the new vector. The system may provide an alternative to some of the cloning methods currently available that use as host.


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